The obviously raising of case of murder and,the strengthened consciousness of anti-investigation make traditional leaving over rate of scene of material evidence of mark greatly reduce with better impression of the hand,footprint,etc.

• 杀人案件的发案率明显提高,犯罪分子的反侦查意识明显加强,使传统的利用较好的手印、足迹等痕迹物证的现场遗留率大为降低。